PixelSpread:

Path: Imaging/Optics

% Compute the pixel spread of a collimated light beam.
   Assumes diffraction limited optics.

   Since version 9.
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   Form:
       PixelSpread
   n = PixelSpread( f, a, lambda, w )
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   ------
   Inputs
   ------
   f              (1,1) Focal length
   a              (1,1) Aperture
   lambda         (1,1) Wavelength
   w              (1,1) Pixel width

   -------
   Outputs
   -------
   n              (1,1) Number of pixels

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